ON THE ULTRA-VIOLET SPARK SPECTRA. 279 
Tabular Description of the Spectra characteristic of Solutions 
containing Magnesium. 
a a 
Wave-lengths of the lines visible 
Parts of magnesium per 100 of solution 
os i 1 | 0-1 | 0-03 | 0-02 | 0-01 | 0-003 | 0-002 | 0-001 
er er er er er er er er 
per cent. ont mh Oat. heed ene a ae uit 
Hundredths 
of an inch 
17°46 4480 4480 | 4480 
59°30 3837-9 | 3837°9| 3837-9 | 3837-9 3837-9 
59°83 {38283 3832°1| 3832°1| 3832-1! 3832-1 
60:07 3829°2 | 3829-2] 3829-2 
142°3 3096°2 | 3096-2) 3096-2 
142°85 {ner 3091-9] 3091°9 
143:18 3089°9 | 3089-9] 3089-9 
168'7 2935°9 | 2935-9| 2935:9/ 2935-9 | 2935-9 2935-9] 2935-9] 2935-9] 2935-9 
17018 2928°2 | 2928-2) 2928-2) 2928-2 2928-2 2998-2] 2928-9] 2998-9] 2998-9 
184-63 2851-2 | 2851-2) 2851:2| 2851-2 2851-2 2851-2| 2851-2) 2851-2] 2851-9 
194-55 2801°6 | 2801:6/ 2801-6| 2801-6 2801-6 2801-6) 2801-6, 2801-6] 2801-6 
195°39 2796°9 | 2796°9| 2796-9) 2796-9 2796-9, 2796-9] 2796-9) 2796-9] 2796-9 
195-95 27941 | 2794-1] 2794-1/ 2794-1| 2794-1) 2794-1| 27941] 2794-1] 2794-1 
196:92 2789°6 | 2789-6/ 2789'6| 2789°6| 2789-6 2789-6] 2789-6] 2789-6] 2789: 
198°64 2781'8 | 2781-8) 2781-8] 2781°8 | 
198-96 | 2780-2 
199°3 2778°7 | 2778-7| 2778-7 | 2778-7 | 2778-7 2778-7 
199-61 [27769 
199-97 2775°5 | 2775°5| 2775°5 | 
A line may be shortened or weakened, but its wave-length in this table denotes 
that although it may be changed it is still visible. The numbers bracketed are the 
waye-lengths of characteristic groups of lines, 
The Indium Spectrum. 
EES SSS EE ee eee eee. ee ee 
Wave-lengths 
Scale numbers SouUNRIERDRSES acer coo ee ee ee ees Ae See | 
1 per cent. 0-1 per cent. 0-01 per cent. 
Hundredths of an inch 
15°88 4510-2 4510°2 
39°91 4101°3 41013 
119°31 3257°8 
119°68 3255°5 3255°5 32555 
151'35 3038°7 30387 3038°7 
168-00 2940°8 2940°8 
177°34 2889°7 2889:7* 
214°56 2709°3 2709°3 
251°76 2559°5 
332°2 2307 2307 
0 FSS EE ee ae ae Se 
* This is barely visible. 
